info = ['python','java','php']
num = [11,22,33]
# 连接
# info1 = " and ".join(info)
# print(info1)
# print("-".join(num))    #序列中如果不是字符元素，报错TypeError: sequence item 0: expected
# str instance, int found
 # 结论：
# 通过连接字符将列表/元组/集合对应字符元素才能连接成字符串